13391431 has 2 divisors, whose sum is σ = 13391432. Its totient is φ = 13391430.

The previous prime is 13391429. The next prime is 13391437. The reversal of 13391431 is 13419331.

13391431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13391431 - 2¹ = 13391429 is a prime.

It is a super-2 number, since 2×13391431² = 358660848455522, which contains 22 as substring.

Together with 13391429, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 13391396 and 13391405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13391437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6695715 + 6695716.

It is an arithmetic number, because the mean of its divisors is an integer number (6695716).

Almost surely, 2^13391431 is an apocalyptic number.

13391431 is a deficient number, since it is larger than the sum of its proper divisors (1).

13391431 is an equidigital number, since it uses as much as digits as its factorization.

13391431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972, while the sum is 25.

The square root of 13391431 is about 3659.4304201610. The cubic root of 13391431 is about 237.4701332711.

The spelling of 13391431 in words is "thirteen million, three hundred ninety-one thousand, four hundred thirty-one".